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<h3>

Eric S. Raymond pushed to branch master

at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/58304de526aeb000322bbf9671fd7808056f47e8">58304de5</a></strong>

<div>

<span>by Eric S. Raymond</span>

<i>at 2019-02-01T15:39:32Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Documentation polishing.

</pre>

</li>

</ul>

<h4>2 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#6c0e848d9b27c760a787866be3861dc47370a1f5">

docs/authentic.adoc

</a>

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<li class="file-stats">

<a href="#60989cd2efcc87316737e04886ba3659d3f1122c">

docs/ntpsec.adoc

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="6c0e848d9b27c760a787866be3861dc47370a1f5">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/58304de526aeb000322bbf9671fd7808056f47e8#6c0e848d9b27c760a787866be3861dc47370a1f5"><strong>docs/authentic.adoc</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -53,8 +53,8 @@ digests. It computes a one-way hash, which verifies that the server</td>

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">has the correct private key and key identifier.</span>

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext">Beware: both commonly supported message digest formats, MD5 and SHA-1,</span>

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<pre style="margin: 0;">-<span id="LC56" class="line" lang="plaintext">have been either entirely or partly cracked<span class="idiff left right"> and should not n</span>e</span>

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<pre style="margin: 0;">-<span id="LC57" class="line" lang="plaintext">considered<span class="idiff left right">c</span> strong security.</span>

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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">have been either entirely or partly cracked<span class="idiff left right">, and should not b</span>e</span>

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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext">considered strong security.</span>

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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext">MAC authentication is is configured using the +key+ subcommand on the</span>

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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">+server+ configuration commands. The authentication options described</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -157,30 +157,23 @@ ID, to authenticate an association. The servers and clients involved</td>

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<pre style="margin: 0;"> <span id="LC157" class="line" lang="plaintext">must agree on the key ID, key type and key to authenticate NTP packets.</span>

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<pre style="margin: 0;"> <span id="LC158" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC159" class="line" lang="plaintext">The message digest is a cryptographic hash computed by an algorithm such</span>

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<pre style="margin: 0;">-<span id="LC160" class="line" lang="plaintext">as MD5 or SHA1. When authentication is specified, a message</span>

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<pre style="margin: 0;">-<span id="LC161" class="line" lang="plaintext">authentication code (MAC) is appended to the NTP packet header. The MAC</span>

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<pre style="margin: 0;">-<span id="LC162" class="line" lang="plaintext">consists of a 32-bit key identifier (key ID) followed by a 128- or</span>

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<pre style="margin: 0;">-<span id="LC163" class="line" lang="plaintext">160-bit message digest. The algorithm computes the digest as the hash of</span>

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<pre style="margin: 0;">-<span id="LC164" class="line" lang="plaintext">the key concatenated with the NTP packet header fields and the key ID.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="165" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

165

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<pre style="margin: 0;">-<span id="LC165" class="line" lang="plaintext">On transmit, the message digest is computed and inserted into the MAC.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="166" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

166

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<pre style="margin: 0;">-<span id="LC166" class="line" lang="plaintext">On receive, the message digest is computed and compared with the MAC.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="167" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

167

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<pre style="margin: 0;">-<span id="LC167" class="line" lang="plaintext">The packet is only accepted if the two MACs are identical. If the client</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

168

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<pre style="margin: 0;">-<span id="LC168" class="line" lang="plaintext">finds a discrepancy, then it ignores the packet but</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

169

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<pre style="margin: 0;">-<span id="LC169" class="line" lang="plaintext">raises the alarm. If this happens at the server, the server returns a</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="170" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

170

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<pre style="margin: 0;">-<span id="LC170" class="line" lang="plaintext">special message called a crypto-NAK. Since the loopback test protects</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="171" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

171

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<pre style="margin: 0;">-<span id="LC171" class="line" lang="plaintext">the crypto-NAK, an intruder cannot disrupt the protocol by sending</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="172" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

172

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<pre style="margin: 0;">-<span id="LC172" class="line" lang="plaintext">a bogus crypto-NAK.</span>

</pre>

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173

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<pre style="margin: 0;">-<span id="LC173" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="174" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

174

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<pre style="margin: 0;">-<span id="LC174" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="175" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

175

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<pre style="margin: 0;">-<span id="LC175" class="line" lang="plaintext">+ntpd+'s digest mode can use any digest supported by libcrypto</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="176" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

176

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<pre style="margin: 0;">-<span id="LC176" class="line" lang="plaintext">from the OpenSSL project.  MD5 digests are 16 bytes.  SHA1 digests are 20 bytes.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="177" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

177

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<pre style="margin: 0;">-<span id="LC177" class="line" lang="plaintext">Longer digests are truncated.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="178" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

178

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<pre style="margin: 0;">-<span id="LC178" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

179

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<pre style="margin: 0;">-<span id="LC179" class="line" lang="plaintext">+ntpd+'s CMAC mode can use any cipher with a CBC mode that is supported by</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="180" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

180

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<pre style="margin: 0;">-<span id="LC180" class="line" lang="plaintext">libcrypto from the OpenSSL project.  AES is short for AES-128.</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="181" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

181

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<td class="diff-line-num new_line old" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC181" class="line" lang="plaintext">AES needs a 16 byte key.  Longer keys are truncated.  Shorter</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="182" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

182

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<pre style="margin: 0;">-<span id="LC182" class="line" lang="plaintext">keys are padded with 0s.  AES MACs are 16 bytes long.  MACs longer</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="183" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

183

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<td class="diff-line-num new_line old" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC183" class="line" lang="plaintext">than 20 bytes will be truncated.</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="184" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

160

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<pre style="margin: 0;">+<span id="LC160" class="line" lang="plaintext">as MD5 or SHA-1. While, +ntpd+'s digest mode could use any digest</span>

</pre>

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<pre style="margin: 0;">+<span id="LC161" class="line" lang="plaintext">supported by libcrypto from the OpenSSL project, in practice MD5 and</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="162" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC162" class="line" lang="plaintext">SHA-1 are the only supported types. This is very unlikely to change</span>

</pre>

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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext">before MAC authentication is obsolesced by NTS.</span>

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<pre style="margin: 0;">+<span id="LC164" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="165" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext">When authentication is specified, a message authentication code (MAC)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC166" class="line" lang="plaintext">is appended to the NTP packet header. The MAC consists of a 32-bit key</span>

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<td class="diff-line-num new new_line" data-linenumber="167" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC167" class="line" lang="plaintext">identifier (key ID) followed by a 128- or 160-bit message digest. The</span>

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<td class="diff-line-num new new_line" data-linenumber="168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC168" class="line" lang="plaintext">algorithm computes the digest as the hash of the key concatenated with</span>

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<pre style="margin: 0;">+<span id="LC169" class="line" lang="plaintext">the NTP packet header fields and the key ID.  On transmit, the message</span>

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<pre style="margin: 0;">+<span id="LC170" class="line" lang="plaintext">digest is computed and inserted into the MAC.  On receive, the message</span>

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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext">digest is computed and compared with the MAC.  The packet is only</span>

</pre>

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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext">accepted if the two MACs are identical. If the client finds a</span>

</pre>

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<pre style="margin: 0;">+<span id="LC173" class="line" lang="plaintext">discrepancy, then it ignores the packet but raises the alarm. If this</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="174" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC174" class="line" lang="plaintext">happens at the server, the server returns a special message called a</span>

</pre>

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<pre style="margin: 0;">+<span id="LC175" class="line" lang="plaintext">crypto-NAK. Since the loopback test protects the crypto-NAK, an</span>

</pre>

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<pre style="margin: 0;">+<span id="LC176" class="line" lang="plaintext">intruder cannot disrupt the protocol by sending a bogus crypto-NAK.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC177" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC178" class="line" lang="plaintext">Keys and related information are specified in a keys file, which must be</span>

</pre>

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<pre style="margin: 0;"> <span id="LC179" class="line" lang="plaintext">distributed and stored using secure means beyond the scope of the NTP</span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="184" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -191,7 +184,6 @@ utility program.  See {ntpkeysman} for details.</td>

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<pre style="margin: 0;"> <span id="LC184" class="line" lang="plaintext">.Figure 1. Typical Symmetric Key File</span>

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">image:pic/sx5.gif["Typical Symmetric Key File",align="center"]</span>

</pre>

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<pre style="margin: 0;"> <span id="LC186" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC194" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext">Figure 1 shows a typical keys file. In this figure, for key IDs in he</span>

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<pre style="margin: 0;"> <span id="LC188" class="line" lang="plaintext">range 1-10, the key is interpreted as a printable ASCII string. For key</span>

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<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">IDs in the range 11-20, the key is a 40-character hex digit string.</span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -210,10 +202,15 @@ for the +ntpq+ utility.</td>

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<pre style="margin: 0;"> <span id="LC202" class="line" lang="plaintext">[[nts]]</span>

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<pre style="margin: 0;"> <span id="LC203" class="line" lang="plaintext">== Network Time Security ==</span>

</pre>

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<pre style="margin: 0;"> <span id="LC204" class="line" lang="plaintext"></span>

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<td class="diff-line-num new old_line" data-linenumber="213" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="205" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC205" class="line" lang="plaintext">NTS (Network Time security) uses the TLS public-key encryption</span>

</pre>

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<pre style="margin: 0;">+<span id="LC206" class="line" lang="plaintext">infrastructure to secure and authenticate associations.</span>

</pre>

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<pre style="margin: 0;">+<span id="LC207" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC208" class="line" lang="plaintext">This section is a placeholder for complete documentation on NTS. The</span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="209" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC209" class="line" lang="plaintext">NTS implementation is work in progress conforming to a draft RFC not</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="210" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC215" class="line" lang="plaintext">yet accepted. NTPsec's future direction is to fully support NTS</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="210" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC216" class="line" lang="plaintext">and remove older, insecure authentication methods.</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="210" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC210" class="line" lang="plaintext">yet accepted.</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="217" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC211" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="217" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="212" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC212" class="line" lang="plaintext">NTPsec's future direction is to fully support NTS and eventually</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="213" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC213" class="line" lang="plaintext">remove older, insecure authentication methods.</span>

</pre>

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<pre style="margin: 0;"> <span id="LC214" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC215" class="line" lang="plaintext">There is some documentation of client-side configuration on the</span>

</pre>

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<pre style="margin: 0;"> <span id="LC216" class="line" lang="plaintext">link:confopt.html#options[Server Commands and Options] page.</span>

</pre>

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<br>

</li>

<li id="60989cd2efcc87316737e04886ba3659d3f1122c">

<a href="https://gitlab.com/NTPsec/ntpsec/commit/58304de526aeb000322bbf9671fd7808056f47e8#60989cd2efcc87316737e04886ba3659d3f1122c"><strong>docs/ntpsec.adoc</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -36,8 +36,8 @@ We retain, however, almost full compatibility and interoperation with</td>

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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">NTP Classic.  The qualification "almost" is required mainly because we</span>

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext">do not support the Autokey (RFC 5906) public-key encryption scheme. It</span>

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">had interoperability and exploitable vulnerability issues too severe</span>

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<td class="diff-line-num old old_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext">to be patched.  We are participating in an IETF<span class="idiff left right"> effort to develop</span></span>

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<td class="diff-line-num new_line old" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext">better security features.</span>

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<td class="diff-line-num new old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext">to be patched.  We are participating in an IETF<span class="idiff left right">'s Network Time</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"><span class="idiff left right">Security effort to develop </span>better security features.</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="41" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"></span>

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<td class="diff-line-num old_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">This project began as an effort to address serious security issues</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="43" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">with NTP Classic, and we intend to keep a particularly strong focus on</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="290" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="290" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -290,6 +290,14 @@ codebase has been outright removed, with less than 5% new code added.</td>

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<pre style="margin: 0;"> <span id="LC290" class="line" lang="plaintext">  same masters as this web documentation, so the two will no longer</span>

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<pre style="margin: 0;"> <span id="LC291" class="line" lang="plaintext">  drift out of synchronization.</span>

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<pre style="margin: 0;"> <span id="LC292" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC293" class="line" lang="plaintext">[[future]]</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="294" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC294" class="line" lang="plaintext">== Future directions ==</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="293" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="295" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC295" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC296" class="line" lang="plaintext">* We intend to fully support Network Time Security and to be first or</span>

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<pre style="margin: 0;">+<span id="LC297" class="line" lang="plaintext">  second interop on that standard once it is finalized.  At that</span>

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<pre style="margin: 0;">+<span id="LC298" class="line" lang="plaintext">  point, older insecure authentication methods (MAC and MS-SNTP) may</span>

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<pre style="margin: 0;">+<span id="LC299" class="line" lang="plaintext">  be removed.</span>

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<pre style="margin: 0;">+<span id="LC300" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC301" class="line" lang="plaintext">'''''</span>

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<pre style="margin: 0;"> <span id="LC302" class="line" lang="plaintext"></span>

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<pre style="margin: 0;"> <span id="LC303" class="line" lang="plaintext">include::includes/footer.adoc[]</span></pre>

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